Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 251 - 300 out of 1,844

Document Document Title
WO2000036745A9
A precision relaxation oscillator with temperature compensation produces a stable clock frequency over wide variations of ambient temperature. The invention has an oscillation generator (100), two independent current generators (200, 300...  
WO/2000/055972A1
The invention relates to a method of generating a control signal and to an arrangement comprising a D/A converter (20) for receiving a digital signal and converting the received signal into an analog control signal. The arrangement compr...  
WO2000031870A3
Methods and systems are provided for frequency generation suitable for use in wireless devices capable of operating at multiple frequencies. Such systems may change the loop gain of an automatic frequency control loop based on the operat...  
WO/2000/038323A1
A frequency synthesizer module with temperature compensation of a crystal oscillator circuit (12) frequency controlled by a varactor (14). A module memory (18) contains information characterizing a temperature dependency of a crystal (10...  
WO/2000/036745A1
A precision relaxation oscillator with temperature compensation produces a stable clock frequency over wide variations of ambient temperature. The invention has an oscillation generator (100), two independent current generators (200, 300...  
WO/2000/031870A2
Methods and systems are provided for frequency generation suitable for use in wireless devices capable of operating at multiple frequencies. Such systems may change the loop gain of an automatic frequency control loop based on the operat...  
WO/2000/028665A1
A radio communication device, which transmits or receives a signal at a predetermined carrier frequency. The device includes a reference oscillator (24), which generates a clock frequency having a clock frequency error relative to a spec...  
WO/2000/024128A1
A stabilized oscillator system (202) comprises an oven controlled crystal oscillator (204) positioned inside an insulating housing. Within the insulating housing, there is a cold plate (206) in thermal contact with the oven controlled cr...  
WO1999057814A3
A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal c...  
WO1999052214A3
A communications device, such as a one-way pager, comprises a receiver having a frequency down-conversion means for frequency converting an input signal using a local oscillator signal generated by a signal generating means, which may co...  
WO/2000/005818A1
The invention concerns a circuit whereof the operational speed varies according to temperature, supply voltage and the intrinsic quality of the circuit transistors, associated with a compensating circuit comprising a constant current sou...  
WO1999048209A3
An oscillator (1) is stabilized by a frequency discriminator in order to reduce its phase noise. A microwave amplifier (4) supplies sufficient power to maintain the oscillation. The oscillator and the frequency discriminator use a common...  
WO/1999/057814A2
A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal c...  
WO/1999/056387A1
A temperature compensated crystal oscillator with an improved phase noise characteristic and a fast start up time includes a large time constant low-pass filter coupled to a temperature compensation circuit (14). At start up the low pass...  
WO/1999/056395A1
The invention is aimed at detecting the dependence of oscillation frequency on temperature during perfect operation of the automatic frequency corrector (AFC), storing information relevant thereto and using said information in phases in ...  
WO/1999/052214A2
A communications device, such as a one-way pager, comprises a receiver having a frequency down-conversion means for frequency converting an input signal using a local oscillator signal generated by a signal generating means, which may co...  
WO/1999/048209A2
An oscillator (1) is stabilized by a frequency discriminator in order to reduce its phase noise. A microwave amplifier (4) supplies sufficient power to maintain the oscillation. The oscillator and the frequency discriminator use a common...  
WO/1999/038260A1
The invention concerns an oscillator (20) designed to supply a periodic voltage (Vo) at a predetermined frequency (f). Said oscillator comprises; a reference source (23) capable of supplying a reference voltage (Vref), said reference sou...  
WO/1999/037018A1
A piezo-oscillator reduced in current consumption and size, comprising a crystal oscillator as a piezoelectric vibrator, an oscillation circuit, a plurality of surface mounted heaters, and a temperature control circuit for controlling th...  
WO1999003194A3
The present invention relates to a quartz generator that comprises an outer housing (1), a plate (2) as well as an inner housing (6) at the bottom of which the resonator is placed in its own housing (9). The inner housing (6) is made in ...  
WO/1999/023753A1
A highly stable single chip crystal controlled oscillator with automatic gain control (AGC). An amplitude detector (15) monitors the output of a crystal controlled oscillator amplifier (12) and produces a feedback signal proportional to ...  
WO1999016172A3
The invention relates to a method for temperature compensation in an electric circuit. In order to get rid of costly manufacturing processes and external components, a PTAT resistor is replaced by a series connection of two resistive ele...  
WO1999003194A9
The present invention relates to a quartz generator that comprises an outer housing (1), a plate (2) as well as an inner housing (6) at the bottom of which the resonator is placed in its own housing (9). The inner housing (6) is made in ...  
WO/1999/016172A2
The invention relates to a method for temperature compensation in an electric circuit. In order to get rid of costly manufacturing processes and external components, a PTAT resistor is replaced by a series connection of two resistive ele...  
WO1998056112A3  
WO/1999/003194A2
The present invention relates to a quartz generator that comprises an outer housing (1), a plate (2) as well as an inner housing (6) at the bottom of which the resonator is placed in its own housing (9). The inner housing (6) is made in ...  
WO/1999/003195A1
A crystal oscillation device with a temperature compensation function comprising: a constant voltage circuit (12) for outputting a predetermined voltage that does not depend on the ambient temperature; a temperature sensor circuit (13) f...  
WO/1999/000902A1
A communication device including a plurality of frequency synthesizers (24, 28, 30). At least one of the frequency synthesizers (24) is driven with a reference frequency from a crystal oscillator (58). The at least one frequency synthesi...  
WO/1998/056105A1
An approximate third-order function generator that controls variables of different orders independently to generate only the third-order component, and a temperature compensation quartz oscillation circuit made by using the generator, wh...  
WO/1998/056112A2
A frequency-drift ($g(D)F) of an oscillator (OSC) is compensated ($m(K)-$g(D)F) by varying various different biasing parameters (V, I) in the oscillator. The biasing parameters (V, I) which are varied may include, for example, voltages (...  
WO/1998/045950A1
The present invention relates to an afc-digitial tuning circuit having an oscillator (1), a digital synthesis system (DDS) (2) to which the frequency f�xtal? of the oscillator (2) is directed as a clock rate and which generates an outp...  
WO/1998/037635A1
Micromachined, thermally insensitive silicon resonators are provided having accuracy equivalent or superior to that of quartz resonators, and are fabricated from a micromechanical, silicon-on-glass process. In one embodiment, such a reso...  
WO/1998/034349A1
Apparatus (52), and associated method (108), for determining frequency deviation (fda) of an oscillator (54) due to aging of the oscillator (54). Frequency deviation of a clock signal generated by the oscillator (54) relative to a refere...  
WO/1998/034123A1
A method and system are provided for calibrating a batch of devices each containing a circuit, which is responsive to a control signal for producing a desired output which varies in accordance with a first predetermined function of a spe...  
WO/1998/031104A1
An inexpensive small-sized PLL (phase-locked loop) oscillator for use as the clock source of a computer, etc., which can output such a high frequency about 40 MHz that is difficult to obtain from a fundamental-based crystal oscillator. T...  
WO/1998/027652A1
A temperature compensation (TC) circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide TC digital data (30) for a cry...  
WO/1998/027651A1
A temperature compensation circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide temperature compensating digital da...  
WO/1998/015053A1
An oscillator that has a substantially-constant voltage source (101) configured such that it does not require the voltage source to be tuned to a particular voltage to oscillate a particular frequency. The oscillator has greater precisio...  
WO/1997/040580A1
A frequency synthesizer (200) with temperature compensation and frequency multiplication. The synthesizer (200) having a temperature uncompensated frequency oscillator (202) coupled to a phase locked loop (206) including at least one tem...  
WO/1997/014183A1
A function-differentiated temperature compensated crystal oscillator (10) is disclosed having an integrated circuit, at least one capacitor and a piezoelectric element being electrically coupled to a leadframe, and being encapsulated in ...  
WO/1997/002657A1
There is described a stabilization process for the local oscillator frequency in wide-band tunable DROs employed in receivers of a digital microwave radio link. A microprocessor, already provided for normal operation control, cyclically ...  
WO/1997/001887A1
A method for automatically compensating for accuracy degradation of the reference oscillator (170) is provided for a communication device (100). The communication device (100) is programmed with a first frequency value to detect a target...  
WO/1996/037959A1
The invention concerns a telecommunication apparatus having a crystal unit as a standard frequency generator. A compensation mode input into the apparatus-specific microprocessor before the operating programme runs counteracts the temper...  
WO/1996/032775A1
A quartz oscillator device having a small-sized semiconductor integrated circuit comprising a memory and a control circuit, and consuming a low power. The quartz oscillator device is equipped with a quartz oscillator, a frequency adjusti...  
WO/1996/025796A1
Chip logic (38), a phase locked loop (PLL) clocking circuit (30), a temperature sensing circuit (32), and a power management circuit (34), are integrated on a very large scale integrated (VLSI) circuit chip. The temperature sensing circu...  
WO/1996/024986A1
A method and an apparatus for compensating for aging and temperature of the crystal in a crystal oscillator. An RF signal which is transmitted by a mobile telephone switching office (MTSO) (108) and received by the antenna (118). The sig...  
WO/1996/021950A1
A frequency stable oscillating device (120) includes an oscillating transistor (22). A heating element is disposed in close proximity to the oscillating transistor (22). A temperature sensor (30) is mounted in close proximity to the osci...  
WO/1996/020535A1
An apparatus for providing excitation of a vapor discharge lamp (12) includes a control circuit (20) for controlling an oscillator circuit (16) during an ignition mode of the vapor discharge lamp (12) to establish and maintain a substant...  
WO/1996/017433A1
A low power temperature compensated crystal oscillator (10) is disclosed. The temperature compensated crystal oscillator (10) has a crystal oscillator circuit (12), a voltage controlled reactance element (30), a temperature compensation ...  
WO/1996/003799A1
Quartz oscillation means is constituted of a parallel circuit of a quartz oscillator (1), an oscillation inverter (3) and a feedback resistor (5), and a fixed capacitance (15) for temperature compensation and a MOS resistance (17) for te...  

Matches 251 - 300 out of 1,844